[PATCH 08/13] staging: iio: tsl2x7x: add range checking to three sysfs attributes

Brian Masney
2018-04-21T00:41:48Z

The sysfs attributes in_illuminance0_target_input,
in_illuminance0_calibrate, and in_proximity0_calibrate did not have
proper range checking in place so this patch adds the correct range
checks.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
drivers/staging/iio/light/tsl2x7x.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
index 56730baea927..15bc0af1bb6c 100644
--- a/drivers/staging/iio/light/tsl2x7x.c
+++ b/drivers/staging/iio/light/tsl2x7x.c
@@ -835,9 +835,10 @@ static ssize_t in_illuminance0_target_input_store(struct device *dev,
if (kstrtoul(buf, 0, &value))
return -EINVAL;

- if (value)
- chip->settings.als_cal_target = value;
+ if (value < 0 || value > 65535)
+ return -ERANGE;

+ chip->settings.als_cal_target = value;
ret = tsl2x7x_invoke_change(indio_dev);
if (ret < 0)
return ret;
@@ -853,14 +854,12 @@ static ssize_t in_illuminance0_calibrate_store(struct device *dev,
bool value;
int ret;

- if (strtobool(buf, &value))
+ if (kstrtobool(buf, &value) || !value)
return -EINVAL;

- if (value) {
- ret = tsl2x7x_als_calibrate(indio_dev);
- if (ret < 0)
- return ret;
- }
+ ret = tsl2x7x_als_calibrate(indio_dev);
+ if (ret < 0)
+ return ret;

ret = tsl2x7x_invoke_change(indio_dev);
if (ret < 0)
@@ -946,14 +945,12 @@ static ssize_t in_proximity0_calibrate_store(struct device *dev,
bool value;
int ret;

- if (strtobool(buf, &value))
+ if (kstrtobool(buf, &value) || !value)
return -EINVAL;

- if (value) {
- ret = tsl2x7x_prox_cal(indio_dev);
- if (ret < 0)
- return ret;
- }
+ ret = tsl2x7x_prox_cal(indio_dev);
+ if (ret < 0)
+ return ret;

ret = tsl2x7x_invoke_change(indio_dev);
if (ret < 0)